Interesting article on Tablet PCs enabling information rich field work.
Mapping the Future of Field Geology - ScienceMatters @ Berkeley
In 1818, William "Strata" Smith ushered in the modern practice of field geology with his publication of the first hand-painted, color geological map of England and Wales. Two centuries later, the tools haven't changed much. Recently though, UC Berkeley geologist George Brimhall and his colleagues have developed mapping software that they hope will bring field geology kicking and screaming into the digital age.
"You can load satellite images, detailed topographic maps, and field data onto the tablet PC so you can view a huge amount of 3D geospatial information while you're outside," Brimhall says.